Comet’s water ‘like that of Earth’s oceans’

BBC – Comet Hartley 2 contains water more like that found on Earth than all the comets we know about, researchers say. A study using the Herschel space telescope aimed to measure the fraction of deuterium, a rare type of hydrogen, present in the comet’s water. Like our oceans, it had half the amount of deuterium seen from other comets. Read article